I dunno about that man, some of the crowds didn't seem that impressive. Are you just talking about the Champions Cup matches or whatever it's called?
Ya top 6 in england league , cletic pro 14, and French top 14 plus the previous winners make the 20 for following year champions cup
So champions cup rugby is never guaranteed year to year
Next 3 in each league get into 2nd tier European cup
Last 3 get not European rugby
France and england have relegation from top division
The later stages of champions cup have those crowds
Big top 14 games to
You get 40,000 at Munster Leinster pro 14 games
And england premier games often have 30/40k
Euro semi and finals up to 80k
Ireland players are contracted to the unions so they game time is controlled they don't play every pro 14 game
England and France with private owners flog the players France the worst for example
Top 14
13 teams home and away = 26 games
9 European games if you why to final
League finals 3
That's 38 club games in a season
Plus 3 November tests
Plus 5 6 nations
You can see what they are so flat when they come here in June
Irish. Players tho are well managed
They would play about 7-10 pro 14 games
Finals 2 games
9 European games (if they get as far as final)